Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Statement of Comprehensive Income [Abstract]
Net earnings	$ 83.8	$ (15.4)	$ 105.9	$ 13.7
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of tax expense of $0.0, $0.6, $0.1 and $0.6, respectively	6.9	(14.8)	5.4	(0.8)
Less: Reclassification adjustments included in net earnings	0.0	0.0	0.0	0.0
Foreign currency translation adjustments	6.9	(14.8)	5.4	(0.8)
Other comprehensive income (loss)	6.9	(14.8)	5.4	(0.8)
Comprehensive income (loss)	$ 90.7	$ (30.2)	$ 111.3	$ 12.9